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SPX CORPORATION ORDER R5-2019-0018 SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 Table F-7. Salinity Water Quality Criteria/Objectives Agricultural WQ Secondary U.S. Effluent Parameter Objective' MCL2 EPA Average' Maximum NAWQC EC: 900, EC (pmhos/cm) 1600, 2200 or Varies or N/A 885 1470 TDS (mg/L) TDS: 500, 1000, 1500 TDS (mg/L) Varies 500, 1000, N/A 534 587 1500 Sulfate (mg/L) Varies 250, 0 0 N/A 32.4 46.4 250, 500, 860 1-hr Chloride (mg/L) Varies 600 2304- 4.2 4.2 day ' Narrative chemical constituent objective of the Basin Plan. Procedures for establishing the applicable numeric limitation to implement the narrative objective can be found in the Policy for Application of Water Quality Objectives, Section 4.2.2.1.9 of the Basin Plan. However,the Basin Plan does not require improvement over naturally occurring background concentrations. In cases where the natural background concentration of a particular constituent exceeds an applicable water quality objective, the natural background concentration will be considered to comply with the objective. 2 The secondary MCLs are for protection of public welfare and are stated as a recommended level, upper level, and a short-term maximum level. 3 Maximum calendar annual average. (1) Chloride. The Secondary MCL for chloride is 250 mg/L, as a recommended level, 500 mg/L as an upper level, and 600 mg/L as a short-term maximum. (2) Electrical Conductivity or Total Dissolved Solids. The Secondary MCL for EC is 900 pmhos/cm as a recommended level, 1600 pmhos/cm as an upper level, and 2200 pmhos/cm as a short-term maximum, or when expressed as TDS is 500 mg/L as a recommended level, 1000 mg/L as an upper level, and 1500 mg/L as a short-term maximum. (3) Sulfate. The Secondary MCL for sulfate is 250 mg/L as a recommended level, 500 mg/L as an upper level, and 600 mg/L as a short-term maximum. (b) RPA Results. The ECS treatment system that is employed to remove Cr A from the groundwater does not add substantive quantities of TDS to the effluent. The Discharger controls pH at the influent to optimize treatment and may adjust pH at the effluent to meet effluent limits. This is the only additions that may add TDS to the discharge. The Stockton Diverting Canal originates from the Calaveras River near Bellota and flows west-southwest to Mormon Slough. The Stockton Diverting Canal is an engineered drainage which re-connects Upper Mormon Slough to the Calaveras River on the East side of Stockton. From ATTACHMENT F— FACT SHEET F-23